There are a few things you can do to accomplish this goal- first and foremost though, you need to bang a new girl(s). DO NOT, however, get a new girlfriend. This only exudes desperation and is a sure fire way to lose the breakup, miserably. Your Ex will think even less of you than when they broke up with you (another tip to win the breakup- initiate the breakup).
And if you do get a new girlfriend quick, make sure that they are at least better looking than your Ex, so your Ex isn't glad to see you stoop to new lows.

When you eat dirt for the first time and leave your family to build a shack in the woods